中断的下半部分之二tasklet

zhanglong71

在linux中使用tasklet
软硬件环境:linux-2.6.36/s3c2440

tasklet是通过软中断实现的，所以它本身也是软中断。

test.c

#include <linux/module.h> #include <linux/init.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/delay.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("zhanglong"); struct tasklet_struct my_tasklet; void tasklet_action(unsigned long arg) {     printk("tasklet handle. arg = %ld\n", arg);     } static irqreturn_t irq_handle(int irq, void *dev_id) {     tasklet_schedule(&my_tasklet);　　　　//再中断处理函数中调度tasklet     printk("------irq handle. dev_id = %d\n", (int)dev_id);     return IRQ_HANDLED; } int test_init(void) {     int ret = 0;     tasklet_init(&my_tasklet, tasklet_action, 789);     set_irq_type(IRQ_EINT0, IRQ_TYPE_EDGE_RISING);     ret = request_irq(IRQ_EINT0, irq_handle, 0, "my irq", (void *)123);     if (ret) {             printk("request irq failed.\n");         return -EBUSY;     }     return 0; } void test_exit(void) {     free_irq(IRQ_EINT0, (void *)123); } module_init(test_init); module_exit(test_exit);

Makefile

#KERNEL    = /home/zl/my2440-2.6.13 KERNEL    = /media/STUDY/linux/kernel/my2440-2.6.36 #KERNEL    = /lib/modules/$(shell uname -r)/build default:     make -C $(KERNEL) M=$(shell pwd) modules clean:     make -C $(KERNEL) M=$(shell pwd) modules clean modules_install:     make -C $(KERNEL) M=$(shell pwd) modules_install INSTALL_MOD_PATH=/home/zl/s3c2440_nfs     depmod -a -b /home/zl/s3c2440_nfs 2.6.13-ZL2440 obj-m    += test.o

make后插入生成的test.ko模块。按下GPF0所在的按键，终端会有输出：
[root@zhanglong mytasklet]# ------irq handle. dev_id = 123
tasklet handle. arg = 789
------irq handle. dev_id = 123
tasklet handle. arg = 789
------irq handle. dev_id = 123
tasklet handle. arg = 789
……